MILES AND GBJNXELL GLACIERS 431 from Mr. A. O. Johnson.1 In 1910 the gap made by this ice mass was still visible and near it there was a broad valley upon the glacier surface and this part of the ice cliff sloped FIG. 65. MAP SHOWING ADVANCE 07 ICH CUFF OF MILES GLAOIEB IN TEH LAKE BETWEEN 1908 AND 1910. (Compiled from maps by railway engineers.) gradually to a 10 to 15 foot cliff at the water's edge instead of forming a precipitous terminus 200 feet high. The cause of this change seems to go back to the winter of 1909, when there was a flood (February 9 to 18), during which Copper River rose 7 feet higher than any previous i Personal communication, February 12,1910.